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scsi-disk: flush cache after disabling it

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SBC says that "if an application client changes the WCE bit from one to
zero via a MODE SELECT command, then the device server shall write
any data in volatile cache to non-volatile medium before completing
the command".

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Paolo Bonzini 2012-10-31 17:14:41 +01:00
parent 346a3017ec
commit accfeb2dd3
1 changed files with 9 additions and 0 deletions
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9
hw/scsi-disk.c
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@ -1387,6 +1387,7 @@ invalid_param_len:
static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
{
SCSIDiskState *s = DO_UPCAST(SCSIDiskState, qdev, r->req.dev);
uint8_t *p = inbuf;
int cmd = r->req.cmd.buf[0];
int len = r->req.cmd.xfer;
@ -1423,6 +1424,14 @@ static void scsi_disk_emulate_mode_select(SCSIDiskReq *r, uint8_t *inbuf)
return;
}
}
if (!bdrv_enable_write_cache(s->qdev.conf.bs)) {
/* The request is used as the AIO opaque value, so add a ref. */
scsi_req_ref(&r->req);
bdrv_acct_start(s->qdev.conf.bs, &r->acct, 0, BDRV_ACCT_FLUSH);
r->req.aiocb = bdrv_aio_flush(s->qdev.conf.bs, scsi_aio_complete, r);
return;
}
scsi_req_complete(&r->req, GOOD);
return;